Consider this the new golden rule of training. And, without the aid of a trainer, that's an element many of us tend to fudge up. We either go too heavy and risk injury—or we go too light, shorting our ...

The final two reps of any set should be challenging, approaching technical failure. And, without the aid of a trainer, that's an element many of us tend to fudge up. We either go too heavy and risk ...